diff --git a/java/com/google/gerrit/plugins/codeowners/backend/CodeOwnerSubmitRule.java b/java/com/google/gerrit/plugins/codeowners/backend/CodeOwnerSubmitRule.java
index 4053413..32c0d58 100644
--- a/java/com/google/gerrit/plugins/codeowners/backend/CodeOwnerSubmitRule.java
+++ b/java/com/google/gerrit/plugins/codeowners/backend/CodeOwnerSubmitRule.java
@@ -99,9 +99,8 @@
       }
     } catch (RestApiException e) {
       logger.atFine().withCause(e).log(
-          String.format(
-              "Couldn't evaluate code owner statuses for patch set %d of change %d.",
-              changeData.currentPatchSet().id().get(), changeData.change().getId().get()));
+          "Couldn't evaluate code owner statuses for patch set %d of change %d.",
+          changeData.currentPatchSet().id().get(), changeData.change().getId().get());
       return Optional.of(notReady());
     } catch (Exception e) {
       // Whether the exception should be treated as RULE_ERROR.
@@ -157,7 +156,7 @@
       if (isRuleError) {
         codeOwnerMetrics.countCodeOwnerSubmitRuleErrors.increment(cause);
 
-        logger.atWarning().log(errorMessage);
+        logger.atWarning().log("%s", errorMessage);
         return Optional.of(ruleError(errorMessage));
       }
       throw new CodeOwnersInternalServerErrorException(errorMessage, e);
diff --git a/java/com/google/gerrit/plugins/codeowners/backend/CodeOwnersOnAddReviewer.java b/java/com/google/gerrit/plugins/codeowners/backend/CodeOwnersOnAddReviewer.java
index a694ce5..68a7672 100644
--- a/java/com/google/gerrit/plugins/codeowners/backend/CodeOwnersOnAddReviewer.java
+++ b/java/com/google/gerrit/plugins/codeowners/backend/CodeOwnersOnAddReviewer.java
@@ -167,9 +167,8 @@
           .call();
     } catch (Exception e) {
       logger.atSevere().withCause(e).log(
-          String.format(
-              "Failed to post code-owners change message for reviewer on change %s in project %s.",
-              changeId, projectName));
+          "Failed to post code-owners change message for reviewer on change %s in project %s.",
+          changeId, projectName);
     }
   }
 
diff --git a/java/com/google/gerrit/plugins/codeowners/backend/config/BackendConfig.java b/java/com/google/gerrit/plugins/codeowners/backend/config/BackendConfig.java
index 05c9f0e..dbe3744 100644
--- a/java/com/google/gerrit/plugins/codeowners/backend/config/BackendConfig.java
+++ b/java/com/google/gerrit/plugins/codeowners/backend/config/BackendConfig.java
@@ -220,7 +220,7 @@
                               SECTION_CODE_OWNERS,
                               branch,
                               KEY_BACKEND));
-                  logger.atSevere().log(e.getMessage());
+                  logger.atSevere().log("%s", e.getMessage());
                   return e;
                 }));
   }
@@ -252,7 +252,7 @@
                               "Code owner backend '%s' that is configured for project %s in"
                                   + " %s.config (parameter %s.%s) not found.",
                               backendName, project, pluginName, SECTION_CODE_OWNERS, KEY_BACKEND));
-                  logger.atSevere().log(e.getMessage());
+                  logger.atSevere().log("%s", e.getMessage());
                   return e;
                 }));
   }
@@ -269,7 +269,7 @@
                           "Code owner backend '%s' that is configured in gerrit.config"
                               + " (parameter plugin.%s.%s) not found.",
                           defaultBackendName, pluginName, KEY_BACKEND));
-              logger.atSevere().log(e.getMessage());
+              logger.atSevere().log("%s", e.getMessage());
               return e;
             });
   }
diff --git a/java/com/google/gerrit/plugins/codeowners/backend/config/CodeOwnersPluginConfigValidator.java b/java/com/google/gerrit/plugins/codeowners/backend/config/CodeOwnersPluginConfigValidator.java
index 97029e0..2353a31 100644
--- a/java/com/google/gerrit/plugins/codeowners/backend/config/CodeOwnersPluginConfigValidator.java
+++ b/java/com/google/gerrit/plugins/codeowners/backend/config/CodeOwnersPluginConfigValidator.java
@@ -106,7 +106,7 @@
               receiveEvent.commit.getName(),
               RefNames.REFS_CONFIG,
               receiveEvent.project.getNameKey());
-      logger.atSevere().withCause(e).log(errorMessage);
+      logger.atSevere().withCause(e).log("%s", errorMessage);
       throw new CommitValidationException(errorMessage, e);
     }
   }
diff --git a/java/com/google/gerrit/plugins/codeowners/validation/CodeOwnerConfigValidator.java b/java/com/google/gerrit/plugins/codeowners/validation/CodeOwnerConfigValidator.java
index 136ffcb..07828b9 100644
--- a/java/com/google/gerrit/plugins/codeowners/validation/CodeOwnerConfigValidator.java
+++ b/java/com/google/gerrit/plugins/codeowners/validation/CodeOwnerConfigValidator.java
@@ -380,7 +380,7 @@
               "skipping code owner config validation not allowed",
               new CommitValidationMessage(e.getMessage(), ValidationMessage.Type.ERROR)));
     } catch (SkipCodeOwnerConfigValidationPushOption.InvalidValueException e) {
-      logger.atFine().log(e.getMessage());
+      logger.atFine().log("%s", e.getMessage());
       return Optional.of(
           ValidationResult.create(
               pluginName,
@@ -445,10 +445,9 @@
       // accept that it's possible to add invalid code owner configs while the plugin configuration
       // is invalid.
       logger.atWarning().log(
-          String.format(
-              "cannot validate code owner config files due to invalid code-owners plugin"
-                  + " configuration: %s",
-              e.getMessage()));
+          "cannot validate code owner config files due to invalid code-owners plugin"
+              + " configuration: %s",
+          e.getMessage());
       return Optional.of(
           ValidationResult.create(
               pluginName,
@@ -463,7 +462,6 @@
               "failed to validate code owner config files in revision %s"
                   + " (project = %s, branch = %s)",
               revCommit.getName(), branchNameKey.project(), branchNameKey.branch());
-      logger.atSevere().withCause(e).log(errorMessage);
       throw new CodeOwnersInternalServerErrorException(errorMessage, e);
     }
   }